From: Ralf Baechle <ralf@linux-mips.org>
Date: Tue, 4 Nov 2014 10:54:29 +0000 (+0100)
Subject: MIPS: Fix strnlen_user() return value in case of overlong strings.
X-Git-Tag: Ubuntu-5.2.0-15.16~12476^2~2
X-Git-Url: https://git.proxmox.com/?a=commitdiff_plain;h=0097761013253930341e23723d64e0845c3f9edd;p=mirror_ubuntu-eoan-kernel.git

MIPS: Fix strnlen_user() return value in case of overlong strings.

We were returning maxlen like the userland strnlen if no '\0' character
was encountered while the kernel version is expected to return a value
larger than maxlen.  Fixed to return maxlen + 1.

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
---

diff --git a/arch/mips/lib/strnlen_user.S b/arch/mips/lib/strnlen_user.S
index f3af6995e2a6..7d12c0dded3d 100644
--- a/arch/mips/lib/strnlen_user.S
+++ b/arch/mips/lib/strnlen_user.S
@@ -40,9 +40,11 @@ FEXPORT(__strnlen_\func\()_nocheck_asm)
 .else
 	EX(lbe, t0, (v0), .Lfault\@)
 .endif
-	PTR_ADDIU	v0, 1
+	.set		noreorder
 	bnez		t0, 1b
-1:	PTR_SUBU	v0, a0
+1:	 PTR_ADDIU	v0, 1
+	.set		reorder
+	PTR_SUBU	v0, a0
 	jr		ra
 	END(__strnlen_\func\()_asm)